Everyone will have their opinions.
But, I tend to agree with Derek a bit on this.

Also, the way I tend to think (not always right!) I would have the word 'Dart' below the car but not change the colour or look.
Then for me, the top part of the poster will look whole. Showing a passage of time from the older car to the newer one.
But, also making a sentence because it will then read:
DART
ON THE ROAD AGAIN

If that makes sense?!

Aside from that, I would be very proud of the artwork.